The vital organs are the brain, the heart, the lungs, the liver and the kidneys. These are organs that a person couldn't live without if one or the pair of them were entirely removed.
Although these organs are necessary for survival, people can live with one lung and one kidney and only part of their liver. The liver is the only organ that can completely regenerate. The heart is the organ that keeps blood and its cargo of oxygen and nutrients circulating throughout the body. The lungs allow the body to breathe. The liver and kidneys remove toxins. The brain controls all of these functions and more.